212221332321 has 16 divisors (see below), whose sum is σ = 283255977984. Its totient is φ = 141333860304.

The previous prime is 212221332319. The next prime is 212221332353. The reversal of 212221332321 is 123233122212.

It is not a de Polignac number, because 212221332321 - 2¹ = 212221332319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212221332291 and 212221332300.

It is not an unprimeable number, because it can be changed into a prime (212221331321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16359780 + ... + 16372746.

It is an arithmetic number, because the mean of its divisors is an integer number (17703498624).

Almost surely, 2^212221332321 is an apocalyptic number.

It is an amenable number.

212221332321 is a deficient number, since it is larger than the sum of its proper divisors (71034645663).

212221332321 is a wasteful number, since it uses less digits than its factorization.

212221332321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18220.

The product of its digits is 1728, while the sum is 24.

Adding to 212221332321 its reverse (123233122212), we get a palindrome (335454454533).

The spelling of 212221332321 in words is "two hundred twelve billion, two hundred twenty-one million, three hundred thirty-two thousand, three hundred twenty-one".